针对传统多载波混沌键控系统中传输速率低、误码性能差的问题，本文提出一种无信号间干扰的多载波降噪差分混沌移位键控方案。通过设计的正交混沌信号发生器得到两路时域正交的混沌载波信号，从而实现无信号间干扰的目的。同时，引入多个预定义的子载波和正交调制技术进一步提高系统的传输速率。接收端利用滑动平均滤波器对接收信号进行平均降噪，可改善系统的误码性能。推导了AWGN信道和多径瑞利衰落信道下的理论BER公式并进行了蒙特卡洛仿真实验。研究结果显示：仿真结果与理论分析基本一致，且系统有较强的抗噪声性能和抗多径干扰能力；相比于传统MC-DCSK系统，相同载波数下的传输速率提高了四倍，相同误码性能下的信噪比可提升将近3 dB。

Aiming at the dominant drawbacks of traditional multicarrier chaotic keying system relating to poor bit error rate and low information transmission rate, a multicarrier noise reduction differential chaos shift keying scheme with no inter-signal interference is proposed in this paper. The designed orthogonal chaotic signal generator is used to obtain two chaotic carrier signals with orthogonal time domain, thus achieving the purpose of no inter-signal interference. Meanwhile, the introduction of multiple predefined subcarriers and orthogonal modulation techniques further increases the transmission rate of the system. The received signal is averaged for noise reduction using a moving average filter at the receiver, which improves the BER performance of the system. Theoretical BER formulas are derived and Monte Carlo simulation experiments are performed under AWGN channels and multipath Rayleigh fading channels. The research results show that the simulation results are basically consistent with the theoretical analysis, and the system has strong anti-noise performance and multipath interference resistance; compared with the traditional MC-DCSK system, the transmission rate can be increased by four times under the same carrier number, and the SNR can be improved by nearly 3 dB under the same BER performance.